There are a lot of shields and different boards available for Arduino, but I want to develop my own PC boards, one shield for the Arduino Uno/Mega and another board for an Arduino UNO.
Both boards have a DFPlayer Mp3 Mini on board in addition to some resistores and connectors. To develop the boards, I used the Fritzing Schema and PCB Layout program, an easy to use solution, that gives what I need for this small PC boards. There are a lot of other solutions available, but for now I use the Fritzing solution. With this solution you can create the Breadboard, the Schematics and the PCB-layout. It's also possible to fabricate the PCB. I used only the fabricate part for checking of my Gerberfiles created with the PCB-layout part.
I found another fast and cheap vendor in China, PCBWay, high quality, very cheap, 24 hours production time for prototype PCB's.
10 PCB's by max size 100x100 mm for $5 + shipping. With DHL and $22 in freight cost, and I had 2 different PCB's, 10 pieces of each, in less than 4 days for $34. And the product was also excellent, just as I ordered it. I will use them again for new PCB's.
The Breadboard, Schema and PCB layout created using Fritzing.